Drilling-machine



I. H WRIGHT.

nmume momma. I APPLICATION FILED DEC. 16. 1919.

Patented July 19, 1921.

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DRILLING MACHINE. APPjLICATION FILED 050.16. I919.

1,385,293. I Patented July19, 1921.

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|. H. WRIGHT.

DRILLING MACHINE. APPLICATION FILED DEC-I6. 1919.

1,385,293, Patented July 19, 1921.

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UNITED STATES PATENT OFFICE.

ISAAC HENRY WRIGHT, 0F MANCHESTER, ENGLAND, .ASSIGNOR T0 SMITH do COVENTRY LIMITED, OF SALI'PORIJ, MANCHESTER, ENG-LAND.

DRILLING-MAGHINE Specification of Letters Patent.

Patented July 19, 1921.

Application filed December 16, 1919. Serial No. 345,297.

To all whom it may concern Be it known that I, Isaac HENRY Wnun-rr, a subject of the King of Great Britain and Ireland, and resident of (:irresle y Ironworks, Salford, Manchester, England, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

This invention relates to drilling machines and has for itsobject to provide improved means for giving automatic feed movements to the drill spindle when the drill comes into contact with the workpiece and for disengaging the automatic feed when the drill has passed through the work, with means for rendering the automatic feed inoperative when desired.

The invention comprises the combination with a ring-like element fulcrumed about a pin or its equivalent and in operative connection with the drill spindle traversing means, of yielding means holding said ring in a mid-position when there is no resist ance to the feed movements of the drill spindle, and the arrangement whereby when resistance is offered to said feed move ments, the ring is turned about its fulcrum until it engages a part in operative connection with the automatic feed gear, whereby the spindle (through the medium of the ring) is given automatic feed movements.

My invention further comprises the details of construction hereinafter described.

Referring to the three accompanying sheets of explanatory drawings Figure 1 is an end view of the feed box with the cover removed.

Fig. 2 is a sectional view on the line A A of Fig. 1.

Fig. 3 is a sectional and C C of Fig. 1.

Fig. 4 is a plan view of the feed box.

Fig. 5 is a sectional elevation on the line D D of Fig. 7 looking from left to right.

Fig. 6 is a sectional view on the line E E of Fig. 7 looking'from right to left.

Fig. 7 is a sectional plan view on the line F F of Fig. 3.

The same reference letters in the different views indicate the same parts.

In the application of my invention illustrated, the automatic feed movements are derived from the drill spindle a by means of the pulley b on the spindle 0 having a view on the lines B B worm (Z thereon driving the worm wheel a and the change speed gears shown. The shaft carries a pinion g which rotates a wheel h having a ratchet wheel '5 keyed in a recess therein, and arouinl the said wheel dis disposed a ring-like part j fulcruined about a pivot pin is in a sleeve m keyed upon the shaft a carrying the rack pinion by which the spindle a is traversed. A spring ball or plunger 0 in the sleeve on aforesaid engages a slot in the ring j when the latter is in its mid-position and with a pawl or toothlike element p carried thereby free from engagement with the ratchet teeth of the wheel 71 within it. The hand lever Q for hand traversing the drill spindle passes through the rack pinion shaft or, the sleeve an about which the ring 7' is fulcrumed, and the said ring j, being sliding fit within the latter but capable of a limited amount of rotary movement relatively to the sleeve m and shaft a.

When the hand lever Q is turned in the usual way, if there is no resistance to the traverse of the drill spindle a, the ring j remains in its mid-position clear of the power rotated ratchet wheel e' and by the rack pinion shaft a is rotated by hand through the ring and sleeve m upon the shaft a. l/Vhcn however, the drill in 'udle enga the work piece the razistance to its movement by the licind lever Q causes the ring y' to turn about its fulcrum pin b, when the pawl 10 thereon engages the teeth of the power rotated ratchet wheel and the drill ing spindle re ivcs power feed movements. hen the drill has passed through the work piece and the resistance to its movement therefore ceases, the ring 7' returns to its mid or neutral position and the spindle a can be raised by the usual. counter balance weight (not shown).

If it is desired to limit the feed movement to any predetermined amount, I may provide an adjustable ring r upon the automatic feed gear box, with a projecting screwed stud s (by which the ring is clamped in position). The said stud can engage a pin it on the ring 7' and bring the latter to rest after any predetermined amount of movement.

To put the automatic feed motion out of operation, I provide a screwed stud a (Fig. 6) which passes through the ring j and can be caused to engage the sleeve on to which the ring is pivoted, so as to prevent any turning of the ring to bring its pawl 39 into engagement with the ratchet wheel 2'.

I may vary the details of my improved mechanism to suit any particular services or requirements.

Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. In means for giving automatic feed movement to drilling machine spindles, the combination comprising concentric clutch elements disposed respectively within and without each other, a ratchet wheel integral with the inner member and a pawl integral with outer member of the said clutch elements, a pivot supporting said outer member, and means imparting rocking movements to such outer member about the said pivot whereby the engagement and disengagement of the said pawl and ratchet wheel is. effected, as set forth.

2. In means for giving automatic feed movements to drilling machine spindles as claimed in claim 1, means for limiting the rotarymotion of the outer member of the said clutch elements to regulate the amount of the automatic feed movements, as set forth.

3. In means for giving automatic feed movements to drilling machine spindles as claimed in claim 1, means for preventing the outer member of the said clutch elements from turning about its fulcrum in order to temporarily prevent the operation of the automatic feed mechanism, as set forth.

4;. In means for giving automatic feed movements to drilling machine spindles. in COHlblllRlllOll, a spur wheel rotated by change speed mechanism from the drilling machine spindle, a wheel with ratchet teeth keyed to said spur wheel and forming the inner member of a clutch, a rack pinion shaft, a sleeve keyed upon said shaft, an outer clutch member fulcrumed about a pin in said sleeve and carrying a tooth or pawl adapted to engage the said ratchet wheel. when th 2 said outer clutch member turns about its fulcrum against the resistance of means tending to hold it in an out-of-service position, as set forth.

In testimony whereof I have signed my name to this specification.

ISAAC HENRY Wllltill'l.

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